Several military bases across Burundi were attacked by insurgents, killing at least 12 attackers.
An army spokesperson said that five soldiers were injured in the clashes.
It is unclear who is behind the violence but the spokesperson said insurgents wanted to take weapons before freeing prisoners.
A presidential adviser, Willy Nyamitwe, said the insurgents had failed, describing them as Sindjuma, meaning "I am not a slave".
The United Nations Human Rights Council will hold a special session on Burundi next
Thursday after a request from the United Sates was submitted to the office.
The call was backed by 18 members of the Council.